Senate immigration bill teeters as it tilts rightward

"The Senate immigration bill is poised to undergo a decidedly rightward shift in an attempt to attract more Republican votes, but that threatens to erode bipartisan consensus.

Democratic and Republican authors of the bill have expressed a willingness to make changes and toughen the border security provisions as the sweeping immigration overhaul heads to the floor next week. But a debate has emerged over how much is too much."